HDMI Forum to AMD: No, you can’t make an open source HDMI 2.1 driver
arstechnica.com
Linux users can't hit the same resolutions and speeds as Windows—or DisplayPort.

HDMI Forum to AMD: No, you can’t make an open source HDMI 2.1 driver | Linux users can’t hit the same resolutions and speeds as Windows—or DisplayPort.::Linux users can’t hit the same resolutions and speeds as Windows—or DisplayPort.